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题库 / Prep2007E2-DS-171
If k is a positive integer and the tens digit of k + 5 is 4, what is the tens digit of k ?
(1) k > 35
(2) The units digit of k is greater than 5.
Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
EACH statement ALONE is sufficient.
Statements (1) and (2) TOGETHER are NOT sufficient.
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36-44=41-49满足1的条件k>35，即有k的十位数为3/4，k的十位数大于5，那么排除41-44，即只有36-39， 所以k的十位数为3*
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